diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index c0c27d834f97..6ee3fd2f2378 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -1113,7 +1113,8 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
 	/* Convert (if necessary) to absolute time */
 	if (flags != TIMER_ABSTIME) {
 		ktime_t now = alarm_bases[type].gettime();
-		exp = ktime_add(now, exp);
+
+		exp = ktime_add_safe(now, exp);
 	}
 
 	if (alarmtimer_do_nsleep(&alarm, exp))